Size depends on various factors from size out of the eggs which can vary from 40 grams to 90 grams, how fast an animal get stated, some eats within a day of their first shed, some may take 8 weeks, prey size (obviously when you start a 90 grams hatchling the prey size will be bigger compare to the one of a 40 grams hatchling), feeding frequency, skip meals, fast, sadly some people are in a rush and feed their animals heavily to make a fast return leading to possible issues such as fatty liver disease, and finally genetics some animals are pre-disposed to be big reaching 4000 grams while some will never be over 2500 grams.
Most of my 2016 are in the 700/800 grams but I also have some that are double that, all are fed appropriate size prey once a week but some have skip meals and some never turned one down.
The bottom line is it does not matter how much your snake weighs in at a certain age what matter is not to underfed, or overfed and you need to pay attention to health and proportions rather than a number on the scale.
Feed smaller prey once a week and every now and then skip a meal this will result in consistent feeders that are less likely to fast and grow at a normal pace.
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